Electrolytic recovery of high purity platinum@ - using concentrated hydrochloric acid solns. contg. alloys in cell contg. cation exchange membrane

摘要

Electrolytic process for recovery of Pt of high purity from conc. HCl solns. of alloys of Pt with Rh, Ir and/or Pd with simultaneous depletion of other precious metal and base metal impurities uses a teflon membrane as cation exchange membrane. The purification process is carried out in an electrolysis cell, divided by a cation exchange membrane under potentiostatic or voltage-controlled conditions of 8-16V and a current density of 12.5-37.5 A/dm2. The deposited pt-alloy metals are processed. The conc. HCl solns. of Pt-alloys have an amt. of 50-700 g/l and total impurities of 5000 ppm of less. ADVANTAGE - Minimal losses during electrolysis.